Web payment / Web shop

I'm looking for a reference page where I can learn how to implement some sort of web-payment procedure in a website. preferably in PHP or perl. Code examples etc.. Where do I find information about that?

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: I'm looking for a reference page where I can learn how to implement some sort of web-payment procedure in a website. preferably in PHP or perl. Code examples etc.. Where do I find information about that?: : thanx: